web: hover event

src/sys/web.rs

@@ -682,4 +682,32 @@ fn connect_event_handlers(
             .unwrap();
         closure.forget();
     }
+
+    // hover (enter)
+    {
+        let events = events.clone();
+        let closure = Closure::wrap(Box::new(move |_: web_sys::MouseEvent| {
+            events
+                .borrow_mut()
+                .push(HoverEvent { entered: true }.to_event());
+        }) as Box<dyn FnMut(_)>);
+        canvas
+            .add_event_listener_with_callback("mouseenter", closure.as_ref().unchecked_ref())
+            .unwrap();
+        closure.forget();
+    }
+
+    // hover (leave)
+    {
+        let events = events.clone();
+        let closure = Closure::wrap(Box::new(move |_: web_sys::MouseEvent| {
+            events
+                .borrow_mut()
+                .push(HoverEvent { entered: false }.to_event());
+        }) as Box<dyn FnMut(_)>);
+        canvas
+            .add_event_listener_with_callback("mouseleave", closure.as_ref().unchecked_ref())
+            .unwrap();
+        closure.forget();
+    }
 }